Fixed #642 - The floating window can not back to normal size after maximizing it

This fix seems to have introduced a regression when _this is deleted before the lambda slot occurred, for example deleting the DockManager (and consequently _this) immediately after the execution of updateTabs function (we encountered this problem in linux)

.clang-format

@@ -0,0 +1,146 @@
+---
+AccessModifierOffset: -4
+AlignAfterOpenBracket: Align
+AlignConsecutiveMacros: None
+AlignConsecutiveAssignments: None
+AlignConsecutiveDeclarations: None
+AlignEscapedNewlines: Right
+AlignOperands: Align
+AlignTrailingComments: true
+
+AllowAllArgumentsOnNextLine: true
+AllowAllParametersOfDeclarationOnNextLine: true
+AllowShortBlocksOnASingleLine: Never
+AllowShortCaseLabelsOnASingleLine: true
+AllowShortFunctionsOnASingleLine: InlineOnly
+AllowShortIfStatementsOnASingleLine: Never
+AllowShortLambdasOnASingleLine: Inline
+AllowShortLoopsOnASingleLine: false
+
+AlwaysBreakAfterReturnType: None
+AlwaysBreakBeforeMultilineStrings: false
+AlwaysBreakTemplateDeclarations: Yes
+
+BinPackArguments: true
+BinPackParameters: true
+
+BraceWrapping:
+  AfterCaseLabel: true
+  AfterClass: true
+  AfterControlStatement: Always
+  AfterEnum: true
+  AfterFunction: true
+  AfterNamespace: true
+  AfterStruct: true
+  AfterUnion: true
+  AfterExternBlock: true
+  BeforeCatch: true
+  BeforeElse: true
+  BeforeLambdaBody: false
+  IndentBraces: false
+  SplitEmptyFunction: false
+  SplitEmptyRecord: false
+  SplitEmptyNamespace: false
+
+BreakBeforeBinaryOperators: NonAssignment
+BreakBeforeBraces: Custom
+BreakBeforeTernaryOperators: false
+BreakConstructorInitializers: BeforeColon
+BreakInheritanceList: AfterColon
+BreakStringLiterals: true
+
+ColumnLimit: 82
+CommentPragmas: '^(!.*|@c)'
+
+CompactNamespaces: false
+
+ConstructorInitializerAllOnOneLineOrOnePerLine: true
+ContinuationIndentWidth: 4
+Cpp11BracedListStyle: true
+
+FixNamespaceComments: true
+
+IncludeBlocks: Regroup
+IncludeCategories:
+  - Regex: '^<windows(\.h)?>'  # windows headers
+    Priority: -1
+  - Regex: '^<labbcan[[:alnum:]._/]+'  # labbcan headers
+    Priority: 1
+  - Regex: '^<diag[[:alnum:]._/]+'  # usl headers
+    Priority: 1
+  - Regex: '^<usl[[:alnum:]._/]+'  # usl headers
+    Priority: 1
+  - Regex: '^<qt5compat[[:alnum:]._/]+'  # qtlabb headers
+    Priority: 2
+  - Regex: '^<qtcoreaddons[[:alnum:]._/]+'  # qtlabb headers
+    Priority: 2
+  - Regex: '^<qtlabb[[:alnum:]._/]+'  # qtlabb headers
+    Priority: 2
+  - Regex: '<Q[[:alnum:].]+>'  # Qt headers
+    Priority: 3
+  - Regex: '^<sila_cpp[[:alnum:]._/]+'  # sila_cpp headers
+    Priority: 4
+  - Regex: '<[[:alnum:]._/]+\.h>'  # other headers
+    Priority: 5
+  - Regex: '<[[:alnum:]._/]+>'  # system headers
+    Priority: 6
+  - Regex: '.*'
+    Priority: 7
+
+IncludeIsMainRegex: '(_p)?$'
+
+IndentCaseBlocks: false
+IndentCaseLabels: false
+IndentPPDirectives: AfterHash
+IndentWidth: 4
+IndentWrappedFunctionNames: false
+
+KeepEmptyLinesAtTheStartOfBlocks: false
+MaxEmptyLinesToKeep: 1
+
+NamespaceIndentation: None
+
+PenaltyBreakAssignment: 20
+PenaltyBreakBeforeFirstCallParameter: 15
+PenaltyBreakComment: 10
+PenaltyBreakFirstLessLess: 5
+# PenaltyBreakOpenParenthesis: 30
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+PenaltyExcessCharacter: 100
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+PenaltyReturnTypeOnItsOwnLine: 150
+
+PointerAlignment: Left
+ReflowComments: true
+
+SortIncludes: CaseSensitive
+SortUsingDeclarations: true
+
+SpaceAfterCStyleCast: false
+SpaceAfterLogicalNot: false
+SpaceAfterTemplateKeyword: false
+
+SpaceBeforeAssignmentOperators: true
+SpaceBeforeCpp11BracedList: false
+SpaceBeforeCtorInitializerColon: true
+SpaceBeforeInheritanceColon: true
+SpaceBeforeParens: ControlStatements
+SpaceBeforeRangeBasedForLoopColon: true
+SpaceBeforeSquareBrackets: false
+SpaceInEmptyBlock: false
+SpaceInEmptyParentheses: false
+
+SpacesBeforeTrailingComments: 2
+SpacesInAngles: Never
+SpacesInCStyleCastParentheses: false
+SpacesInConditionalStatement: false
+SpacesInParentheses: false
+SpacesInSquareBrackets: false
+
+Standard: c++17
+
+StatementMacros: [ 'Q_UNUSED', 'PIMPL_D', 'PIMPL_Q', 'OD_ENTRY', 'OD_ENTRY_PROCIMG' ]
+
+TabWidth: 4
+UseTab: Never

README.md

@@ -368,7 +368,7 @@ The application can be compiled for macOS. A user reported, that the library wor
 [![Build Status](https://travis-ci.org/githubuser0xFFFF/Qt-Advanced-Docking-System.svg?branch=master)](https://travis-ci.org/githubuser0xFFFF/Qt-Advanced-Docking-System)
 [![Build status](https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/workflows/linux-builds/badge.svg)](https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/actions?query=workflow%3Alinux-builds)
 
-Unfortunately, there is no such thing as a Linux operating system. Linux is a heterogeneous environment with a variety of different distributions. So it is not possible to support "Linux" like this is possible for Windows. It is only possible to support and test a small subset of Linux distributions. The library can be compiled for and has been developed and tested with the some Linux distributions. Depending on the used window manager or compositor, dock widgets
+Unfortunately, there is no such thing as a Linux operating system. Linux is a heterogeneous environment with a variety of different distributions. So it is not possible to support "Linux" like it is possible for Windows. It is only possible to support and test a small subset of Linux distributions. The library can be compiled for and has been developed and tested with some Linux distributions. Depending on the used window manager or compositor, dock widgets
 with native title bars are supported or not. If native title bars are not supported,
 the library switches to `QWidget` based title bars.
 

demo/MainWindow.cpp

@@ -592,19 +592,29 @@ void MainWindowPrivate::createActions()
 	ui.toolBar->addAction(ui.actionRestoreState);
 	ui.actionRestoreState->setIcon(svgIcon(":/adsdemo/images/restore.svg"));
 
-	SavePerspectiveAction = new QAction("Create Perspective", _this);
-	SavePerspectiveAction->setIcon(svgIcon(":/adsdemo/images/picture_in_picture.svg"));
-	_this->connect(SavePerspectiveAction, SIGNAL(triggered()), SLOT(savePerspective()));
+	ui.toolBar->addSeparator();
+
+	QAction* a = ui.toolBar->addAction("Lock Workspace");
+	a->setIcon(svgIcon(":/adsdemo/images/lock_outline.svg"));
+	a->setCheckable(true);
+	a->setChecked(false);
+	QObject::connect(a, &QAction::triggered, _this, &CMainWindow::lockWorkspace);
+
 	PerspectiveListAction = new QWidgetAction(_this);
 	PerspectiveComboBox = new QComboBox(_this);
 	PerspectiveComboBox->setSizeAdjustPolicy(QComboBox::AdjustToContents);
-	PerspectiveComboBox->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
+	PerspectiveComboBox->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
 	PerspectiveListAction->setDefaultWidget(PerspectiveComboBox);
-	ui.toolBar->addSeparator();
 	ui.toolBar->addAction(PerspectiveListAction);
+
+	a = SavePerspectiveAction = ui.toolBar->addAction("Create Perspective");
+	a->setIcon(svgIcon(":/adsdemo/images/picture_in_picture.svg"));
+	QObject::connect(a, &QAction::triggered, _this, &CMainWindow::savePerspective);
 	ui.toolBar->addAction(SavePerspectiveAction);
 
-	QAction* a = ui.toolBar->addAction("Create Floating Editor");
+	ui.toolBar->addSeparator();
+
+	a = ui.toolBar->addAction("Create Floating Editor");
 	a->setProperty("Floating", true);
 	a->setToolTip("Creates floating dynamic dockable editor windows that are deleted on close");
 	a->setIcon(svgIcon(":/adsdemo/images/note_add.svg"));
@@ -626,6 +636,7 @@ void MainWindowPrivate::createActions()
 	_this->connect(a, SIGNAL(triggered()), SLOT(createEditor()));
 	ui.menuTests->addAction(a);
 
+	ui.toolBar->addSeparator();
 	a = ui.toolBar->addAction("Create Floating Table");
 	a->setToolTip("Creates floating dynamic dockable table with millions of entries");
 	a->setIcon(svgIcon(":/adsdemo/images/grid_on.svg"));
@@ -1030,3 +1041,17 @@ void CMainWindow::createImageViewer()
 	}
 }
 
+
+//============================================================================
+void CMainWindow::lockWorkspace(bool Value)
+{
+	if (Value)
+	{
+		d->DockManager->lockDockWidgetFeaturesGlobally();
+	}
+	else
+	{
+		d->DockManager->lockDockWidgetFeaturesGlobally(ads::CDockWidget::NoDockWidgetFeatures);
+	}
+}
+

demo/MainWindow.h

@@ -68,6 +68,7 @@ private slots:
 	void toggleDockWidgetWindowTitle();
 	void applyVsStyle();
 	void createImageViewer();
+	void lockWorkspace(bool Value);
 };
 
 #endif // MAINWINDOW_H

demo/demo.qrc

@@ -36,5 +36,8 @@
         <file>images/panorama.svg</file>
         <file>images/ads_icon2.svg</file>
         <file>images/font_download.svg</file>
+        <file>images/lock_outline.svg</file>
+        <file>images/lock.svg</file>
+        <file>images/lock_open.svg</file>
     </qresource>
 </RCC>

demo/images/lock.svg

@@ -0,0 +1,6 @@
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0,0,1024,1024">
+	<desc>lock icon - Licensed under Apache License v2.0 (http://www.apache.org/licenses/LICENSE-2.0) - Created with Iconfu.com - Derivative work of Material icons (Copyright Google Inc.)</desc>
+	<g fill="#03b8e5" fill-rule="nonzero" style="mix-blend-mode: normal">
+		<path d="M853.33,426.67v426.66c0,46.93 -38.4,85.34 -85.33,85.34h-512c-46.93,0 -85.33,-38.41 -85.33,-85.34v-426.66c0,-46.93 38.4,-85.34 85.33,-85.34h42.67v-85.33c0,-117.76 95.57,-213.33 213.33,-213.33c117.76,0 213.33,95.57 213.33,213.33v85.33h42.67c46.93,0 85.33,38.41 85.33,85.34zM644.27,256c0,-72.96 -59.31,-132.27 -132.27,-132.27c-72.96,0 -132.27,59.31 -132.27,132.27v85.33h264.54zM597.33,640c0,-46.93 -38.4,-85.33 -85.33,-85.33c-46.93,0 -85.33,38.4 -85.33,85.33c0,46.93 38.4,85.33 85.33,85.33c46.93,0 85.33,-38.4 85.33,-85.33z"/>
+	</g>
+</svg>

demo/images/lock_open.svg

@@ -0,0 +1,6 @@
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0,0,1024,1024">
+	<desc>lock_open icon - Licensed under Apache License v2.0 (http://www.apache.org/licenses/LICENSE-2.0) - Created with Iconfu.com - Derivative work of Material icons (Copyright Google Inc.)</desc>
+	<g fill="#03b8e5" fill-rule="nonzero" style="mix-blend-mode: normal">
+		<path d="M853.33,426.67v426.66c0,46.93 -38.4,85.34 -85.33,85.34h-512c-46.93,0 -85.33,-38.41 -85.33,-85.34v-426.66c0,-46.93 38.4,-85.34 85.33,-85.34h388.27v-85.33c0,-72.96 -59.31,-132.27 -132.27,-132.27c-72.96,0 -132.27,59.31 -132.27,132.27h-81.06c0,-117.76 95.57,-213.33 213.33,-213.33c117.76,0 213.33,95.57 213.33,213.33v85.33h42.67c46.93,0 85.33,38.41 85.33,85.34zM768,426.67h-512v426.66h512zM426.67,640c0,-46.93 38.4,-85.33 85.33,-85.33c46.93,0 85.33,38.4 85.33,85.33c0,46.93 -38.4,85.33 -85.33,85.33c-46.93,0 -85.33,-38.4 -85.33,-85.33z"/>
+	</g>
+</svg>

demo/images/lock_outline.svg

@@ -0,0 +1,6 @@
+<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0,0,1024,1024">
+	<desc>lock_outline icon - Licensed under Apache License v2.0 (http://www.apache.org/licenses/LICENSE-2.0) - Created with Iconfu.com - Derivative work of Material icons (Copyright Google Inc.)</desc>
+	<g fill="#03b8e5" fill-rule="nonzero" style="mix-blend-mode: normal">
+		<path d="M853.33,426.67v426.66c0,46.93 -38.4,85.34 -85.33,85.34h-512c-46.93,0 -85.33,-38.41 -85.33,-85.34v-426.66c0,-46.93 38.4,-85.34 85.33,-85.34h42.67v-85.33c0,-117.76 95.57,-213.33 213.33,-213.33c117.76,0 213.33,95.57 213.33,213.33v85.33h42.67c46.93,0 85.33,38.41 85.33,85.34zM768,426.67h-512v426.66h512zM379.73,341.33h264.54v-85.33c0,-72.96 -59.31,-132.27 -132.27,-132.27c-72.96,0 -132.27,59.31 -132.27,132.27zM426.67,640c0,-46.93 38.4,-85.33 85.33,-85.33c46.93,0 85.33,38.4 85.33,85.33c0,46.93 -38.4,85.33 -85.33,85.33c-46.93,0 -85.33,-38.4 -85.33,-85.33z"/>
+	</g>
+</svg>

doc/ads_qt_marketplace_description.md

@@ -12,10 +12,10 @@ styles as much as possible.
 
 ## Features
 
-### Docking everywhere - no central widget
+### Docking everywhere - with or without a central widget
 
-There is no central widget like in the Qt docking system. You can dock on every
-border of the main window or you can dock into each dock area - so you are
+The Advanced Docking System works with or without a central widget.
+You can dock on every border of the main window or you can dock into each dock area - so you are
 free to dock almost everywhere.
 
 ![Dropping widgets](https://raw.githubusercontent.com/githubuser0xFFFF/Qt-Advanced-Docking-System/master/doc/preview-dragndrop.png)

doc/user-guide.md

@@ -303,8 +303,9 @@ or to close it via the close button.
 
 ![HideSingleCentralWidgetTitleBar true](cfg_flag_HideSingleCentralWidgetTitleBar_true.png)
 
-The Advanced Docking System is meant for applications without a static central
-widget and normally does not know anything about a central static widget.
+Unless a central widget explicitly has been set with setCentralWidget, the
+Advanced Docking System is without a static central widget and it wouldn't know
+about a central static widget.
 Therefore this flag is disabled by default and a central single dock widget
 still has a titlebar to drag it out of the main window.
 

examples/configflags/CMakeLists.txt

@@ -0,0 +1,28 @@
+cmake_minimum_required(VERSION 3.5)
+project(ads_example_centralwidget VERSION ${VERSION_SHORT}) 
+find_package(QT NAMES Qt6 Qt5 COMPONENTS Core REQUIRED)
+find_package(Qt${QT_VERSION_MAJOR} 5.5 COMPONENTS Core Gui Widgets REQUIRED)
+set(CMAKE_INCLUDE_CURRENT_DIR ON)
+add_executable(configFlagsExample WIN32 
+    main.cpp
+    mainwindow.cpp
+    mainwindow.ui
+)
+target_include_directories(CentralWidgetExample PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/../../src")
+target_link_libraries(CentralWidgetExample PRIVATE qt${QT_VERSION_MAJOR}advanceddocking)
+target_link_libraries(CentralWidgetExample PUBLIC Qt${QT_VERSION_MAJOR}::Core 
+                                                  Qt${QT_VERSION_MAJOR}::Gui 
+                                                  Qt${QT_VERSION_MAJOR}::Widgets)
+set_target_properties(CentralWidgetExample PROPERTIES 
+    AUTOMOC ON
+    AUTORCC ON
+    AUTOUIC ON
+    CXX_STANDARD 14
+    CXX_STANDARD_REQUIRED ON
+    CXX_EXTENSIONS OFF
+    VERSION ${VERSION_SHORT}
+    EXPORT_NAME "Qt Advanced Docking System Central Widget Example"
+    ARCHIVE_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${ads_PlatformDir}/lib"
+    LIBRARY_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${ads_PlatformDir}/lib"
+    RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/${ads_PlatformDir}/bin"
+)

examples/configflags/configflags.pro

@@ -0,0 +1,34 @@
+ADS_OUT_ROOT = $${OUT_PWD}/../..
+
+QT       += core gui widgets
+
+TARGET = ConfigFlagsExample
+DESTDIR = $${ADS_OUT_ROOT}/lib
+TEMPLATE = app
+CONFIG += c++14
+CONFIG += debug_and_release
+adsBuildStatic {
+    DEFINES += ADS_STATIC
+}
+
+# The following define makes your compiler emit warnings if you use
+# any Qt feature that has been marked deprecated (the exact warnings
+# depend on your compiler). Please consult the documentation of the
+# deprecated API in order to know how to port your code away from it.
+DEFINES += QT_DEPRECATED_WARNINGS
+
+SOURCES += \
+    main.cpp \
+    mainwindow.cpp
+
+HEADERS += \
+    mainwindow.h
+
+FORMS += \
+    mainwindow.ui
+
+LIBS += -L$${ADS_OUT_ROOT}/lib
+include(../../ads.pri)
+INCLUDEPATH += ../../src
+DEPENDPATH += ../../src
+

examples/configflags/main.cpp

@@ -0,0 +1,10 @@
+#include <mainwindow.h>
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    CMainWindow w;
+    w.show();
+    return a.exec();
+}

examples/configflags/mainwindow.cpp

@@ -0,0 +1,65 @@
+#include "mainwindow.h"
+
+#include "ui_mainwindow.h"
+
+#include <QLabel>
+#include <QToolBar>
+
+#include "DockAreaWidget.h"
+#include "DockAreaTitleBar.h"
+
+
+using namespace ads;
+
+
+CMainWindow::CMainWindow(QWidget *parent) :
+	QMainWindow(parent),
+	ui(new Ui::CMainWindow)
+{
+	ui->setupUi(this);
+
+	// Add the toolbar
+	auto toolbar_ = addToolBar("Top Toolbar");
+
+	// Create the dock manager
+	ads::CDockManager::setConfigFlags(ads::CDockManager::DefaultOpaqueConfig);
+	ads::CDockManager::setConfigFlag(ads::CDockManager::DockAreaHasCloseButton,
+	    false);
+	ads::CDockManager::setConfigFlag(ads::CDockManager::DockAreaHasUndockButton,
+	    false);
+	ads::CDockManager::setConfigFlag(
+	    ads::CDockManager::DockAreaHasTabsMenuButton, false);
+	auto DockManager = new ads::CDockManager(this);
+
+	// Create a dockable widget
+	QLabel *l1 = new QLabel();
+	l1->setWordWrap(true);
+	l1->setAlignment(Qt::AlignTop | Qt::AlignLeft);
+	l1->setText("Docking widget 1");
+	ads::CDockWidget *dockWidget1 = new ads::CDockWidget("Dock 1");
+	dockWidget1->setWidget(l1);
+	DockManager->addDockWidget(ads::LeftDockWidgetArea, dockWidget1);
+
+	QLabel *l2 = new QLabel();
+	l2->setWordWrap(true);
+	l2->setAlignment(Qt::AlignTop | Qt::AlignLeft);
+	l2->setText("Docking widget 2");
+	ads::CDockWidget *dockWidget2 = new ads::CDockWidget("Dock 2");
+	dockWidget2->setWidget(l2);
+	DockManager->addDockWidget(ads::RightDockWidgetArea, dockWidget2);
+
+	// Add menu actions
+	ui->menuView->addAction(dockWidget1->toggleViewAction());
+	ui->menuView->addAction(dockWidget2->toggleViewAction());
+	toolbar_->addAction(dockWidget1->toggleViewAction());
+	toolbar_->addAction(dockWidget2->toggleViewAction());
+}
+
+
+CMainWindow::~CMainWindow()
+{
+    delete ui;
+}
+
+
+

examples/configflags/mainwindow.h

@@ -0,0 +1,27 @@
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+#include <QComboBox>
+#include <QWidgetAction>
+
+#include "DockManager.h"
+#include "DockAreaWidget.h"
+#include "DockWidget.h"
+
+QT_BEGIN_NAMESPACE
+namespace Ui { class CMainWindow; }
+QT_END_NAMESPACE
+
+class CMainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    CMainWindow(QWidget *parent = nullptr);
+    ~CMainWindow();
+
+private:
+    Ui::CMainWindow *ui;
+};
+#endif // MAINWINDOW_H

examples/configflags/mainwindow.ui

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>CMainWindow</class>
+ <widget class="QMainWindow" name="CMainWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>1284</width>
+    <height>757</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>MainWindow</string>
+  </property>
+  <widget class="QWidget" name="centralwidget"/>
+  <widget class="QMenuBar" name="menubar">
+   <property name="geometry">
+    <rect>
+     <x>0</x>
+     <y>0</y>
+     <width>1284</width>
+     <height>21</height>
+    </rect>
+   </property>
+   <widget class="QMenu" name="menuView">
+    <property name="title">
+     <string>View</string>
+    </property>
+   </widget>
+   <addaction name="menuView"/>
+  </widget>
+  <widget class="QToolBar" name="toolBar">
+   <property name="windowTitle">
+    <string>toolBar</string>
+   </property>
+   <attribute name="toolBarArea">
+    <enum>TopToolBarArea</enum>
+   </attribute>
+   <attribute name="toolBarBreak">
+    <bool>false</bool>
+   </attribute>
+  </widget>
+ </widget>
+ <resources/>
+ <connections/>
+</ui>

examples/dockindock/main.cpp

@@ -1,5 +1,5 @@
 #include <QApplication>
-#include "../../examples/simple/MainWindow.h"
+#include "mainframe.h"
 
 int main(int argc, char *argv[])
 {

examples/examples.pro

@@ -8,4 +8,5 @@ SUBDIRS = \
 	sidebar \
 	deleteonclose \
 	emptydockarea \
-	dockindock
+	dockindock \
+	configflags

sip/DockAreaTitleBar.sip

@@ -12,10 +12,14 @@ class CTitleBarButton : QToolButton
     %End
     
 public:
-	CTitleBarButton(bool visible = true, QWidget* parent /TransferThis/ = Q_NULLPTR );
+	CTitleBarButton(bool ShowInTitleBar, bool HideWhenDisabled, TitleBarButton ButtonId,
+		QWidget* /TransferThis/ = Q_NULLPTR );
 	virtual void setVisible(bool);
 	void setShowInTitleBar(bool);
 
+    TitleBarButton buttonId() const;
+	ads::CDockAreaTitleBar* titleBar() const;
+    bool isInAutoHideArea() const;
 
 protected:
 	bool event(QEvent *ev);
@@ -44,13 +48,15 @@ public:
 	ads::CDockAreaTabBar* tabBar() const;
 	ads::CTitleBarButton* button(ads::TitleBarButton which) const;
     ads::CElidingLabel* autoHideTitleLabel() const;
+    ads::CDockAreaWidget* dockAreaWidget() const;
  	void updateDockWidgetActionsButtons();
 	virtual void setVisible(bool Visible);
 	void insertWidget(int index, QWidget *widget /Transfer/ );
 	int indexOf(QWidget *widget) const;
     QString titleBarButtonToolTip(ads::TitleBarButton Button) const;
     void setAreaFloating();
-    
+    void showAutoHideControls(bool Show);
+    bool isAutoHide() const;
 
 signals:
 	void tabBarClicked(int index);

sip/DockAreaWidget.sip

@@ -41,6 +41,7 @@ public:
 	ads::CDockManager* dockManager() const;
 	ads::CDockContainerWidget* dockContainer() const;
     ads::CAutoHideDockContainer* autoHideDockContainer() const;
+    ads::CDockSplitter* parentSplitter() const;
     bool isAutoHide() const;
     void setAutoHideDockContainer(CAutoHideDockContainer*);
 	virtual QSize minimumSizeHint() const;

sip/DockContainerWidget.sip

@@ -20,13 +20,14 @@ class CDockContainerWidget : QFrame
 
 protected:
 	virtual bool event(QEvent *e);
-	QSplitter* rootSplitter() const;
+	ads::CDockSplitter* rootSplitter() const;
     ads::CAutoHideDockContainer* createAndSetupAutoHideContainer(ads::SideBarLocation area, ads::CDockWidget* DockWidget /Transfer/, int TabIndex = -1);
 	void createRootSplitter();
 	void dropFloatingWidget(ads::CFloatingDockContainer* FloatingWidget, const QPoint& TargetPos);
     void dropWidget(QWidget* Widget, DockWidgetArea DropArea, CDockAreaWidget* TargetAreaWidget, int TabIndex = -1);
 	void addDockArea(ads::CDockAreaWidget* DockAreaWidget /Transfer/, ads::DockWidgetArea area = ads::CenterDockWidgetArea);
 	void removeDockArea(ads::CDockAreaWidget* area /TransferBack/);
+    /*QList<QPointer<ads::CDockAreaWidget>> removeAllDockAreas();*/
 	void saveState(QXmlStreamWriter& Stream) const;
 	bool restoreState(CDockingStateReader& Stream, bool Testing);
 	ads::CDockAreaWidget* lastAddedDockAreaWidget(ads::DockWidgetArea area) const;

sip/DockManager.sip

@@ -172,6 +172,8 @@ public:
         FloatingContainerForceNativeTitleBar,
         FloatingContainerForceQWidgetTitleBar,
         MiddleMouseButtonClosesTab,
+        DisableTabTextEliding,
+        ShowTabTextOnlyForActiveTab,
         DefaultDockAreaButtons,
 		DefaultBaseConfig,
         DefaultOpaqueConfig,
@@ -188,6 +190,8 @@ public:
 		AutoHideSideBarsIconOnly,
 		AutoHideShowOnMouseOver,
         AutoHideCloseButtonCollapsesDock,
+        AutoHideHasCloseButton,
+        AutoHideHasMinimizeButton,
 		DefaultAutoHideConfig,
 	};
     typedef QFlags<ads::CDockManager::eAutoHideFlag> AutoHideFlags;
@@ -245,6 +249,12 @@ public:
     void setSplitterSizes(ads::CDockAreaWidget *ContainedArea, const QList<int>& sizes);
     static void setFloatingContainersTitle(const QString& Title);
 	static QString floatingContainersTitle();
+    void setDockWidgetToolBarStyle(Qt::ToolButtonStyle Style, ads::CDockWidget::eState State);
+    Qt::ToolButtonStyle dockWidgetToolBarStyle(ads::CDockWidget::eState State) const;
+    void setDockWidgetToolBarIconSize(const QSize& IconSize, ads::CDockWidget::eState State);
+    QSize dockWidgetToolBarIconSize(ads::CDockWidget::eState State) const;
+    ads::CDockWidget::DockWidgetFeatures globallyLockedDockWidgetFeatures() const;
+    void lockDockWidgetFeaturesGlobally(ads::CDockWidget::DockWidgetFeatures Features = ads::CDockWidget::GloballyLockableFeatures);
 
 public slots:
     void endLeavingMinimizedState();

sip/DockWidget.sip

@@ -39,6 +39,7 @@ public:
         DefaultDockWidgetFeatures,
         AllDockWidgetFeatures,
         DockWidgetAlwaysCloseAndDelete,
+        GloballyLockableFeatures,
 		NoDockWidgetFeatures
 	};
     typedef QFlags<ads::CDockWidget::DockWidgetFeature> DockWidgetFeatures;
@@ -49,6 +50,12 @@ public:
 		StateDocked,
 		StateFloating
 	};
+    
+    enum eToolBarStyleSource
+    {
+    	ToolBarStyleFromDockManager,
+    	ToolBarStyleFromDockWidget
+    };
 
 	enum eInsertMode
 	{
@@ -72,7 +79,7 @@ public:
 	};
 
 
-	CDockWidget(const QString &title, QWidget* parent /TransferThis/ = 0);
+	CDockWidget(const QString &title, QWidget* parent /TransferThis/ = Q_NULLPTR);
 	virtual ~CDockWidget();
 	virtual QSize minimumSizeHint() const;
 	void setWidget(QWidget* widget /Transfer/, ads::CDockWidget::eInsertMode InsertMode = AutoScrollArea);
@@ -82,6 +89,7 @@ public:
 	void setFeatures(ads::CDockWidget::DockWidgetFeatures features);
 	void setFeature(ads::CDockWidget::DockWidgetFeature flag, bool on);
 	ads::CDockWidget::DockWidgetFeatures features() const;
+    void notifyFeaturesChanged();
 	ads::CDockManager* dockManager() const;
 	ads::CDockContainerWidget* dockContainer() const;
     ads::CFloatingDockContainer* floatingDockContainer() const;
@@ -95,6 +103,7 @@ public:
 	bool isInFloatingContainer() const;
 	bool isClosed() const;
 	QAction* toggleViewAction() const;
+    void setToggleViewAction(QAction* action);
 	void setToggleViewActionMode(ads::CDockWidget::eToggleViewActionMode Mode);
 	void setMinimumSizeHintMode(ads::CDockWidget::eMinimumSizeHintMode Mode);
     ads::CDockWidget::eMinimumSizeHintMode minimumSizeHintMode() const;
@@ -104,6 +113,8 @@ public:
 	QToolBar* toolBar() const;
 	QToolBar* createDefaultToolBar();
 	void setToolBar(QToolBar* ToolBar /Transfer/ );
+    void setToolBarStyleSource(ads::CDockWidget::eToolBarStyleSource Source);
+    ads::CDockWidget::eToolBarStyleSource toolBarStyleSource() const;
 	void setToolBarStyle(Qt::ToolButtonStyle Style, ads::CDockWidget::eState State);
 	Qt::ToolButtonStyle toolBarStyle(ads::CDockWidget::eState State) const;
 	void setToolBarIconSize(const QSize& IconSize, ads::CDockWidget::eState State);

sip/ElidingLabel.sip

@@ -17,8 +17,8 @@ protected:
     virtual void mouseDoubleClickEvent( QMouseEvent *ev );
     
 public:
-	CElidingLabel(QWidget* parent /TransferThis/ = 0, Qt::WindowFlags f = 0);
-	CElidingLabel(const QString& text, QWidget* parent /TransferThis/ = 0, Qt::WindowFlags f = 0);
+	CElidingLabel(QWidget* parent /TransferThis/ = Q_NULLPTR, Qt::WindowFlags f = Qt::WindowFlags ());
+	CElidingLabel(const QString& text, QWidget* parent /TransferThis/ = Q_NULLPTR, Qt::WindowFlags f = Qt::WindowFlags ());
 	virtual ~CElidingLabel();
 	Qt::TextElideMode elideMode() const;
 	void setElideMode(Qt::TextElideMode mode);

sip/FloatingDockContainer.sip

@@ -44,6 +44,7 @@ protected:
     void startDragging(const QPoint& DragStartMousePos, const QSize& Size,
         QWidget* MouseEventHandler);
 	virtual void finishDragging();
+    void deleteContent();
 	void initFloatingGeometry(const QPoint& DragStartMousePos, const QSize& Size);
 	void moveFloating();
 	bool restoreState(ads::CDockingStateReader& Stream, bool Testing);
@@ -82,6 +83,7 @@ public:
     bool hasTopLevelDockWidget() const;
     ads::CDockWidget* topLevelDockWidget() const;
     QList<ads::CDockWidget*> dockWidgets() const;
+    void finishDropOperation();
     
     %If (WS_X11)
     void onMaximizeRequest();

sip/ads_globals.sip

@@ -73,7 +73,8 @@ namespace ads
         TitleBarButtonTabsMenu,
         TitleBarButtonUndock,
         TitleBarButtonClose,
-        TitleBarButtonAutoHide
+        TitleBarButtonAutoHide,
+        TitleBarButtonMinimize
     };
 
     enum eDragState

src/AutoHideDockContainer.h

@@ -34,7 +34,7 @@
 #include <QSplitter>
 #include "AutoHideTab.h"
 
-class QXmlStreamWriter;
+QT_FORWARD_DECLARE_CLASS(QXmlStreamWriter)
 
 namespace ads
 {

src/AutoHideSideBar.cpp

@@ -414,7 +414,14 @@ void CAutoHideSideBar::saveState(QXmlStreamWriter& s) const
 QSize CAutoHideSideBar::minimumSizeHint() const
 {
 	QSize Size = sizeHint();
-	Size.setWidth(10);
+	if (d->isHorizontal())
+	{
+		Size.setWidth(0);
+	}
+	else
+	{
+		Size.setHeight(0);
+	}
 	return Size;
 }
 

src/AutoHideSideBar.h

@@ -33,7 +33,7 @@
 #include "ads_globals.h"
 #include "AutoHideTab.h"
 
-class QXmlStreamWriter;
+QT_FORWARD_DECLARE_CLASS(QXmlStreamWriter)
 
 namespace ads
 {

src/AutoHideTab.cpp

@@ -44,7 +44,6 @@
 
 namespace ads
 {
-static const char* const LocationProperty = "Location";
 
 /**
  * Private data class of CDockWidgetTab class (pimpl)
@@ -102,7 +101,7 @@ struct AutoHideTabPrivate
 		QMenu* Menu)
 	{
 		auto Action = Menu->addAction(Title);
-		Action->setProperty("Location", Location);
+		Action->setProperty(internal::LocationProperty, Location);
 		QObject::connect(Action, &QAction::triggered, _this, &CAutoHideTab::onAutoHideToActionClicked);
 		Action->setEnabled(Location != _this->sideBarLocation());
 		return Action;
@@ -174,7 +173,7 @@ void AutoHideTabPrivate::updateOrientation()
 bool AutoHideTabPrivate::startFloating(eDragState DraggingState)
 {
 	auto DockArea = DockWidget->dockAreaWidget();
-    ADS_PRINT("isFloating " << dockContainer->isFloating());
+    ADS_PRINT("isFloating " << dockContainer()->isFloating());
 
     ADS_PRINT("startFloating");
 	DragState = DraggingState;
@@ -419,7 +418,7 @@ void CAutoHideTab::unpinDockWidget()
 //===========================================================================
 void CAutoHideTab::onAutoHideToActionClicked()
 {
-	int Location = sender()->property(LocationProperty).toInt();
+	int Location = sender()->property(internal::LocationProperty).toInt();
 	d->DockWidget->setAutoHide(true, (SideBarLocation)Location);
 }
 

src/CMakeLists.txt

@@ -1,5 +1,6 @@
 cmake_minimum_required(VERSION 3.5)
 project(QtAdvancedDockingSystem LANGUAGES CXX VERSION ${VERSION_SHORT})
+include(GNUInstallDirs)
 if (${QT_VERSION_MAJOR})
   message(STATUS "Forced to use Qt version ${QT_VERSION_MAJOR}")
   find_package(QT NAMES Qt${QT_VERSION_MAJOR} COMPONENTS Core REQUIRED)
@@ -36,7 +37,7 @@ set(ads_SRCS
     AutoHideTab.cpp
     AutoHideDockContainer.cpp
     PushButton.cpp
-	ResizeHandle.cpp
+    ResizeHandle.cpp
     ads.qrc
 )
 set(ads_HEADERS
@@ -62,7 +63,7 @@ set(ads_HEADERS
     AutoHideTab.h
     AutoHideDockContainer.h
     PushButton.h
-	ResizeHandle.h
+    ResizeHandle.h
 )
 add_compile_options("$<$<CXX_COMPILER_ID:MSVC>:/utf-8>")
 if (UNIX AND NOT APPLE)
@@ -120,7 +121,7 @@ write_basic_package_version_file(
     COMPATIBILITY SameMajorVersion
 )
 install(FILES ${ads_HEADERS}
-    DESTINATION include/${library_name}
+    DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${library_name}
     COMPONENT headers
 )
 install(FILES
@@ -131,25 +132,25 @@ install(FILES
 )
 install(TARGETS ${library_name}
     EXPORT adsTargets
-    RUNTIME DESTINATION bin
-    LIBRARY DESTINATION lib
-    ARCHIVE DESTINATION lib
-    INCLUDES DESTINATION include/${library_name}
+    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+    INCLUDES DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${library_name}
 )
 
 install(EXPORT adsTargets
     FILE adsTargets.cmake
     NAMESPACE ads::
-    DESTINATION lib/cmake/${library_name}
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${library_name}
 )
 install(FILES qtadvanceddockingConfig.cmake RENAME ${library_name}Config.cmake
-    DESTINATION lib/cmake/${library_name}
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${library_name}
 )
 install(FILES "${CMAKE_CURRENT_BINARY_DIR}/${library_name}ConfigVersion.cmake"
-    DESTINATION lib/cmake/${library_name}
+    DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${library_name}
 )
 
 target_include_directories(${library_name} PUBLIC
-    $<INSTALL_INTERFACE:include>
+    $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
     $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>
 )

src/DockAreaTabBar.cpp

@@ -111,8 +111,9 @@ void DockAreaTabBarPrivate::updateTabs()
 			// Sometimes the synchronous calculation of the rectangular area fails
 			// Therefore we use QTimer::singleShot here to execute the call
 			// within the event loop - see #520
-			QTimer::singleShot(0, [&, TabWidget]{
-			    _this->ensureWidgetVisible(TabWidget);
+			QTimer::singleShot(0, _this, [&, TabWidget]
+			{
+				_this->ensureWidgetVisible(TabWidget);
 			});
 		}
 		else
@@ -389,15 +390,18 @@ void CDockAreaTabBar::onTabWidgetMoved(const QPoint& GlobalPos)
 
 	int fromIndex = d->TabsLayout->indexOf(MovingTab);
 	auto MousePos = mapFromGlobal(GlobalPos);
-	MousePos.rx() = qMax(d->firstTab()->geometry().left(), MousePos.x());
-	MousePos.rx() = qMin(d->lastTab()->geometry().right(), MousePos.x());
+	MousePos.rx() = qMax(0, MousePos.x());
+	MousePos.rx() = qMin(width(), MousePos.x());
 	int toIndex = -1;
 	// Find tab under mouse
 	for (int i = 0; i < count(); ++i)
 	{
 		CDockWidgetTab* DropTab = tab(i);
+		auto TabGeometry = DropTab->geometry();
+		TabGeometry.setTopLeft(d->TabsContainerWidget->mapToParent(TabGeometry.topLeft()));
+		TabGeometry.setBottomRight(d->TabsContainerWidget->mapToParent(TabGeometry.bottomRight()));
 		if (DropTab == MovingTab || !DropTab->isVisibleTo(this)
-		    || !DropTab->geometry().contains(MousePos))
+		    || !TabGeometry.contains(MousePos))
 		{
 			continue;
 		}
@@ -544,6 +548,13 @@ int CDockAreaTabBar::tabInsertIndexAt(const QPoint& Pos) const
 	}
 }
 
+
+//===========================================================================
+bool CDockAreaTabBar::areTabsOverflowing() const
+{
+	return d->TabsContainerWidget->width() > width();
+}
+
 } // namespace ads
 
 

src/DockAreaTabBar.h

@@ -153,6 +153,12 @@ public:
 	 */
 	virtual QSize sizeHint() const override;
 
+	/**
+	 * This function returns true, if the tabs need more space than the size
+	 * of the tab bar.
+	 */
+	bool areTabsOverflowing() const;
+
 public Q_SLOTS:
 	/**
 	 * This property sets the index of the tab bar's visible tab

src/DockAreaTitleBar.cpp

@@ -60,7 +60,6 @@
 
 namespace ads
 {
-static const char* const LocationProperty = "Location";
 
 /**
  * Private data class of CDockAreaTitleBar class (pimpl)
@@ -159,7 +158,7 @@ struct DockAreaTitleBarPrivate
 		QMenu* Menu)
 	{
 		auto Action = Menu->addAction(Title);
-		Action->setProperty("Location", Location);
+		Action->setProperty(internal::LocationProperty, Location);
 		QObject::connect(Action, &QAction::triggered, _this, &CDockAreaTitleBar::onAutoHideToActionClicked);
 		return Action;
 	}
@@ -179,7 +178,8 @@ void DockAreaTitleBarPrivate::createButtons()
 	QSizePolicy ButtonSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);
 
 	// Tabs menu button
-	TabsMenuButton = new CTitleBarButton(testConfigFlag(CDockManager::DockAreaHasTabsMenuButton));
+	TabsMenuButton = new CTitleBarButton(testConfigFlag(CDockManager::DockAreaHasTabsMenuButton),
+		false, TitleBarButtonTabsMenu);
 	TabsMenuButton->setObjectName("tabsMenuButton");
 	TabsMenuButton->setAutoRaise(true);
 	TabsMenuButton->setPopupMode(QToolButton::InstantPopup);
@@ -197,7 +197,8 @@ void DockAreaTitleBarPrivate::createButtons()
 		SLOT(onTabsMenuActionTriggered(QAction*)));
 
 	// Undock button
-	UndockButton = new CTitleBarButton(testConfigFlag(CDockManager::DockAreaHasUndockButton));
+	UndockButton = new CTitleBarButton(testConfigFlag(CDockManager::DockAreaHasUndockButton),
+		true, TitleBarButtonUndock);
 	UndockButton->setObjectName("detachGroupButton");
 	UndockButton->setAutoRaise(true);
 	internal::setToolTip(UndockButton, QObject::tr("Detach Group"));
@@ -208,7 +209,8 @@ void DockAreaTitleBarPrivate::createButtons()
 
 	// AutoHide Button
 	const auto autoHideEnabled = testAutoHideConfigFlag(CDockManager::AutoHideFeatureEnabled);
-	AutoHideButton = new CTitleBarButton(testAutoHideConfigFlag(CDockManager::DockAreaHasAutoHideButton) && autoHideEnabled);
+	AutoHideButton = new CTitleBarButton(testAutoHideConfigFlag(CDockManager::DockAreaHasAutoHideButton) && autoHideEnabled,
+		true, TitleBarButtonAutoHide);
 	AutoHideButton->setObjectName("dockAreaAutoHideButton");
 	AutoHideButton->setAutoRaise(true);
 	internal::setToolTip(AutoHideButton, _this->titleBarButtonToolTip(TitleBarButtonAutoHide));
@@ -220,7 +222,8 @@ void DockAreaTitleBarPrivate::createButtons()
 	_this->connect(AutoHideButton, SIGNAL(clicked()),  SLOT(onAutoHideButtonClicked()));
 
 	// Minimize button
-	MinimizeButton = new CTitleBarButton(testAutoHideConfigFlag(CDockManager::AutoHideHasMinimizeButton));
+	MinimizeButton = new CTitleBarButton(testAutoHideConfigFlag(CDockManager::AutoHideHasMinimizeButton),
+		false, TitleBarButtonMinimize);
 	MinimizeButton->setObjectName("dockAreaMinimizeButton");
 	MinimizeButton->setAutoRaise(true);
 	MinimizeButton->setVisible(false);
@@ -231,7 +234,8 @@ void DockAreaTitleBarPrivate::createButtons()
 	_this->connect(MinimizeButton, SIGNAL(clicked()), SLOT(minimizeAutoHideContainer()));
 
 	// Close button
-	CloseButton = new CTitleBarButton(testConfigFlag(CDockManager::DockAreaHasCloseButton));
+	CloseButton = new CTitleBarButton(testConfigFlag(CDockManager::DockAreaHasCloseButton),
+		true, TitleBarButtonClose);
 	CloseButton->setObjectName("dockAreaCloseButton");
 	CloseButton->setAutoRaise(true);
 	internal::setButtonIcon(CloseButton, QStyle::SP_TitleBarCloseButton, ads::DockAreaCloseIcon);
@@ -373,27 +377,48 @@ CDockAreaTabBar* CDockAreaTitleBar::tabBar() const
 	return d->TabBar;
 }
 
+
+//============================================================================
+void CDockAreaTitleBar::resizeEvent(QResizeEvent *event)
+{
+	Super::resizeEvent(event);
+	if (CDockManager::testConfigFlag(CDockManager::DockAreaDynamicTabsMenuButtonVisibility)
+	 && CDockManager::testConfigFlag(CDockManager::DisableTabTextEliding))
+	{
+		markTabsMenuOutdated();
+	}
+}
+
+
 //============================================================================
 void CDockAreaTitleBar::markTabsMenuOutdated()
 {
-	if(DockAreaTitleBarPrivate::testConfigFlag(CDockManager::DockAreaDynamicTabsMenuButtonVisibility))
+	if (CDockManager::testConfigFlag(CDockManager::DockAreaDynamicTabsMenuButtonVisibility))
 	{
-		bool hasElidedTabTitle = false;
-		for (int i = 0; i < d->TabBar->count(); ++i)
+		bool TabsMenuButtonVisible = false;
+		if (CDockManager::testConfigFlag(CDockManager::DisableTabTextEliding))
 		{
-			if (!d->TabBar->isTabOpen(i))
-			{
-				continue;
-			}
-			CDockWidgetTab* Tab = d->TabBar->tab(i);
-			if(Tab->isTitleElided())
-			{
-				hasElidedTabTitle = true;
-				break;
-			}
+			TabsMenuButtonVisible = d->TabBar->areTabsOverflowing();
 		}
-		bool visible = (hasElidedTabTitle && (d->TabBar->count() > 1));
-		QMetaObject::invokeMethod(d->TabsMenuButton, "setVisible", Qt::QueuedConnection, Q_ARG(bool, visible));
+		else
+		{
+			bool hasElidedTabTitle = false;
+			for (int i = 0; i < d->TabBar->count(); ++i)
+			{
+				if (!d->TabBar->isTabOpen(i))
+				{
+					continue;
+				}
+				CDockWidgetTab* Tab = d->TabBar->tab(i);
+				if(Tab->isTitleElided())
+				{
+					hasElidedTabTitle = true;
+					break;
+				}
+			}
+			TabsMenuButtonVisible = (hasElidedTabTitle && (d->TabBar->count() > 1));
+		}
+		QMetaObject::invokeMethod(d->TabsMenuButton, "setVisible", Qt::QueuedConnection, Q_ARG(bool, TabsMenuButtonVisible));
 	}
 	d->MenuOutdated = true;
 }
@@ -510,7 +535,7 @@ void CDockAreaTitleBar::updateDockWidgetActionsButtons()
 	int InsertIndex = indexOf(d->TabsMenuButton);
 	for (auto Action : Actions)
 	{
-		auto Button = new CTitleBarButton(true, this);
+		auto Button = new CTitleBarButton(true, false, TitleBarButtonTabsMenu, this);
 		Button->setDefaultAction(Action);
 		Button->setAutoRaise(true);
 		Button->setPopupMode(QToolButton::InstantPopup);
@@ -564,7 +589,7 @@ void CDockAreaTitleBar::onAutoHideDockAreaActionClicked()
 //============================================================================
 void CDockAreaTitleBar::onAutoHideToActionClicked()
 {
-	int Location = sender()->property(LocationProperty).toInt();
+	int Location = sender()->property(internal::LocationProperty).toInt();
 	d->DockArea->toggleAutoHide((SideBarLocation)Location);
 }
 
@@ -856,10 +881,25 @@ void CDockAreaTitleBar::showAutoHideControls(bool Show)
 
 
 //============================================================================
-CTitleBarButton::CTitleBarButton(bool showInTitleBar, QWidget* parent)
+bool CDockAreaTitleBar::isAutoHide() const
+{
+	return d->DockArea && d->DockArea->isAutoHide();
+}
+
+
+//============================================================================
+CDockAreaWidget* CDockAreaTitleBar::dockAreaWidget() const
+{
+	return d->DockArea;
+}
+
+
+//============================================================================
+CTitleBarButton::CTitleBarButton(bool showInTitleBar, bool hideWhenDisabled, TitleBarButton ButtonId, QWidget* parent)
 	: tTitleBarButton(parent),
 	  ShowInTitleBar(showInTitleBar),
-	  HideWhenDisabled(CDockManager::testConfigFlag(CDockManager::DockAreaHideDisabledButtons))
+	  HideWhenDisabled(CDockManager::testConfigFlag(CDockManager::DockAreaHideDisabledButtons) && hideWhenDisabled),
+	  TitleBarButtonId(ButtonId)
 {
     setFocusPolicy(Qt::NoFocus);
 }
@@ -894,16 +934,47 @@ void CTitleBarButton::setShowInTitleBar(bool Show)
 //============================================================================
 bool CTitleBarButton::event(QEvent *ev)
 {
-	if (QEvent::EnabledChange == ev->type() && HideWhenDisabled)
+	if (QEvent::EnabledChange != ev->type() || !HideWhenDisabled || !ShowInTitleBar)
 	{
-		// force setVisible() call 
-		// Calling setVisible() directly here doesn't work well when button is expected to be shown first time
-		QMetaObject::invokeMethod(this, "setVisible", Qt::QueuedConnection, Q_ARG(bool, isEnabled()));
+		return Super::event(ev);
 	}
 
+	bool Show = true;
+	if (isInAutoHideArea())
+	{
+		switch (TitleBarButtonId)
+        {
+		case TitleBarButtonClose: Show = CDockManager::testAutoHideConfigFlag(CDockManager::AutoHideHasCloseButton); break;
+		case TitleBarButtonUndock: Show = false; break;
+		default:
+			break;
+        }
+	}
+
+	// force setVisible() call - Calling setVisible() directly here doesn't
+	// work well when button is expected to be shown first time
+	QMetaObject::invokeMethod(this, "setVisible", Qt::QueuedConnection,
+		Q_ARG(bool, isEnabledTo(this->parentWidget()) & Show));
+
 	return Super::event(ev);
 }
 
+
+//============================================================================
+CDockAreaTitleBar* CTitleBarButton::titleBar() const
+{
+	return qobject_cast<CDockAreaTitleBar*>(parentWidget());
+}
+
+
+//============================================================================
+bool CTitleBarButton::isInAutoHideArea() const
+{
+	auto TitleBar = titleBar();
+    return TitleBar && TitleBar->isAutoHide();
+}
+
+
 //============================================================================
 CSpacerWidget::CSpacerWidget(QWidget* Parent /*= 0*/) : Super(Parent)
 {

src/DockAreaTitleBar.h

@@ -43,6 +43,7 @@ class CDockAreaTabBar;
 class CDockAreaWidget;
 struct DockAreaTitleBarPrivate;
 class CElidingLabel;
+class CDockAreaTitleBar;
 
 using tTitleBarButton = QToolButton;
 
@@ -59,10 +60,12 @@ class CTitleBarButton : public tTitleBarButton
 private:
 	bool ShowInTitleBar = true;
 	bool HideWhenDisabled = false;
+	TitleBarButton TitleBarButtonId;
 
 public:
 	using Super = tTitleBarButton;
-	CTitleBarButton(bool ShowInTitleBar = true, QWidget* parent = nullptr);
+	CTitleBarButton(bool ShowInTitleBar, bool HideWhenDisabled, TitleBarButton ButtonId,
+		QWidget* parent = nullptr);
 
 	/**
 	* Adjust this visibility change request with our internal settings:
@@ -74,6 +77,22 @@ public:
 	 */
 	void setShowInTitleBar(bool Show);
 
+	/**
+	 * Identifier for the title bar button
+	 */
+	TitleBarButton buttonId() const {return TitleBarButtonId;}
+
+	/**
+	 * Return the title bar that contains this button
+     */
+	CDockAreaTitleBar* titleBar() const;
+
+	/**
+	 * Returns true, if the button is in a title bar in an auto hide area
+	 */
+	bool isInAutoHideArea() const;
+
+
 protected:
 	/**
 	* Handle EnabledChanged signal to set button invisible if the configured
@@ -133,6 +152,11 @@ protected:
 	 */
 	virtual void contextMenuEvent(QContextMenuEvent *event) override;
 
+	/**
+	 * Handle resize events
+	 */
+	virtual void resizeEvent(QResizeEvent *event) override;
+
 public Q_SLOTS:
 	/**
 	 * Call this slot to tell the title bar that it should update the tabs menu
@@ -169,6 +193,11 @@ public:
 	 */
 	CElidingLabel* autoHideTitleLabel() const;
 
+	/**
+     * Returns the dock area widget that contains this title bar
+     */
+	CDockAreaWidget* dockAreaWidget() const;
+
 	/**
 	 * Updates the visibility of the dock widget actions in the title bar
 	 */
@@ -215,6 +244,11 @@ public:
 	 */
 	void showAutoHideControls(bool Show);
 
+	/**
+	 * Returns true, if the auto hide controls are visible
+	 */
+	bool isAutoHide() const;
+
 Q_SIGNALS:
 	/**
 	 * This signal is emitted if a tab in the tab bar is clicked by the user

src/DockAreaTitleBar_p.h

@@ -52,7 +52,7 @@ class CSpacerWidget : public QWidget
 	Q_OBJECT
 public:
 	using Super = QWidget;
-	CSpacerWidget(QWidget* Parent = 0);
+	CSpacerWidget(QWidget* Parent = nullptr);
 	virtual QSize sizeHint() const override {return QSize(0, 0);}
 	virtual QSize minimumSizeHint() const override {return QSize(0, 0);}
 };

src/DockAreaWidget.cpp

@@ -81,7 +81,7 @@ class CDockAreaLayout
 {
 private:
 	QBoxLayout* m_ParentLayout;
-	QList<QWidget*> m_Widgets;
+	QList<QPointer<QWidget>> m_Widgets;
 	int m_CurrentIndex = -1;
 	QWidget* m_CurrentWidget = nullptr;
 
@@ -370,10 +370,21 @@ void DockAreaWidgetPrivate::updateTitleBarButtonStates()
 		return;
 	}
 
-	TitleBar->button(TitleBarButtonClose)->setEnabled(
-		_this->features().testFlag(CDockWidget::DockWidgetClosable));
-	TitleBar->button(TitleBarButtonUndock)->setEnabled(
-		_this->features().testFlag(CDockWidget::DockWidgetFloatable));
+	if (_this->isAutoHide())
+	{
+		if (CDockManager::testAutoHideConfigFlag(CDockManager::AutoHideHasCloseButton))
+        {
+			TitleBar->button(TitleBarButtonClose)->setEnabled(
+				_this->features().testFlag(CDockWidget::DockWidgetClosable));
+        }
+	}
+	else
+	{
+		TitleBar->button(TitleBarButtonUndock)->setEnabled(
+			_this->features().testFlag(CDockWidget::DockWidgetFloatable));
+		TitleBar->button(TitleBarButtonClose)->setEnabled(
+			_this->features().testFlag(CDockWidget::DockWidgetClosable));
+	}
 	TitleBar->button(TitleBarButtonAutoHide)->setEnabled(
 		_this->features().testFlag(CDockWidget::DockWidgetPinnable));
 	TitleBar->updateDockWidgetActionsButtons();
@@ -393,7 +404,7 @@ void DockAreaWidgetPrivate::updateTitleBarButtonVisibility(bool IsTopLevel)
 	bool IsAutoHide = _this->isAutoHide();
 	if (IsAutoHide)
 	{
-		bool ShowCloseButton = CDockManager::autoHideConfigFlags().testFlag(CDockManager::AutoHideHasCloseButton);
+		bool ShowCloseButton = CDockManager::testAutoHideConfigFlag(CDockManager::AutoHideHasCloseButton);
 		TitleBar->button(TitleBarButtonClose)->setVisible(ShowCloseButton);
 		TitleBar->button(TitleBarButtonAutoHide)->setVisible(true);
 		TitleBar->button(TitleBarButtonUndock)->setVisible(false);
@@ -410,7 +421,8 @@ void DockAreaWidgetPrivate::updateTitleBarButtonVisibility(bool IsTopLevel)
 	else
 	{
 		TitleBar->button(TitleBarButtonClose)->setVisible(true);
-		TitleBar->button(TitleBarButtonAutoHide)->setVisible(true);
+		bool ShowAutoHideButton = CDockManager::testAutoHideConfigFlag(CDockManager::DockAreaHasAutoHideButton);
+		TitleBar->button(TitleBarButtonAutoHide)->setVisible(ShowAutoHideButton);
 		TitleBar->button(TitleBarButtonUndock)->setVisible(true);
         TitleBar->button(TitleBarButtonTabsMenu)->setVisible(true);
 	}
@@ -756,7 +768,7 @@ int CDockAreaWidget::openDockWidgetsCount() const
 	int Count = 0;
 	for (int i = 0; i < d->ContentsLayout->count(); ++i)
 	{
-		if (!dockWidget(i)->isClosed())
+		if (dockWidget(i) && !dockWidget(i)->isClosed())
 		{
 			++Count;
 		}
@@ -772,7 +784,7 @@ QList<CDockWidget*> CDockAreaWidget::openedDockWidgets() const
 	for (int i = 0; i < d->ContentsLayout->count(); ++i)
 	{
 		CDockWidget* DockWidget = dockWidget(i);
-		if (!DockWidget->isClosed())
+		if (DockWidget && !DockWidget->isClosed())
 		{
 			DockWidgetList.append(dockWidget(i));
 		}
@@ -786,7 +798,7 @@ int CDockAreaWidget::indexOfFirstOpenDockWidget() const
 {
 	for (int i = 0; i < d->ContentsLayout->count(); ++i)
 	{
-		if (!dockWidget(i)->isClosed())
+		if (dockWidget(i) && !dockWidget(i)->isClosed())
 		{
 			return i;
 		}
@@ -809,7 +821,6 @@ CDockWidget* CDockAreaWidget::dockWidget(int Index) const
 	return qobject_cast<CDockWidget*>(d->ContentsLayout->widget(Index));
 }
 
-
 //============================================================================
 void CDockAreaWidget::reorderDockWidget(int fromIndex, int toIndex)
 {

src/DockContainerWidget.cpp

@@ -141,7 +141,7 @@ public:
 	CDockContainerWidget* _this;
 	QPointer<CDockManager> DockManager;
 	unsigned int zOrderIndex = 0;
-	QList<CDockAreaWidget*> DockAreas;
+	QList<QPointer<CDockAreaWidget>> DockAreas;
 	QList<CAutoHideDockContainer*> AutoHideWidgets;
 	QMap<SideBarLocation, CAutoHideSideBar*> SideTabBarWidgets;
 	QGridLayout* Layout = nullptr;
@@ -299,7 +299,11 @@ public:
 		VisibleDockAreaCount = 0;
 		for (auto DockArea : DockAreas)
 		{
-			VisibleDockAreaCount += DockArea->isHidden() ? 0 : 1;
+			if (!DockArea)
+			{
+				continue;
+			}
+			VisibleDockAreaCount += (DockArea->isHidden() ? 0 : 1);
 		}
 	}
 
@@ -924,7 +928,10 @@ void DockContainerWidgetPrivate::addDockAreasToList(const QList<CDockAreaWidget*
 //============================================================================
 void DockContainerWidgetPrivate::appendDockAreas(const QList<CDockAreaWidget*> NewDockAreas)
 {
-	DockAreas.append(NewDockAreas);
+	for (auto *newDockArea : NewDockAreas)
+	{
+		DockAreas.append(newDockArea);
+	}
 	for (auto DockArea : NewDockAreas)
 	{
 		QObject::connect(DockArea,
@@ -1636,12 +1643,21 @@ emitAndExit:
 }
 
 
+//============================================================================
+QList<QPointer<CDockAreaWidget>> CDockContainerWidget::removeAllDockAreas()
+{
+	auto Result = d->DockAreas;
+	d->DockAreas.clear();
+	return Result;
+}
+
+
 //============================================================================
 CDockAreaWidget* CDockContainerWidget::dockAreaAt(const QPoint& GlobalPos) const
 {
 	for (const auto& DockArea : d->DockAreas)
 	{
-		if (DockArea->isVisible() && DockArea->rect().contains(DockArea->mapFromGlobal(GlobalPos)))
+		if (DockArea && DockArea->isVisible() && DockArea->rect().contains(DockArea->mapFromGlobal(GlobalPos)))
 		{
 			return DockArea;
 		}
@@ -1678,7 +1694,7 @@ int CDockContainerWidget::visibleDockAreaCount() const
 	int Result = 0;
 	for (auto DockArea : d->DockAreas)
 	{
-		Result += DockArea->isHidden() ? 0 : 1;
+		Result += (!DockArea || DockArea->isHidden()) ? 0 : 1;
 	}
 
 	return Result;
@@ -1749,7 +1765,7 @@ void CDockContainerWidget::dropFloatingWidget(CFloatingDockContainer* FloatingWi
 	if (Dropped)
 	{ 
 		// Fix https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/issues/351
-		FloatingWidget->hideAndDeleteLater();
+		FloatingWidget->finishDropOperation();
 
 		// If we dropped a floating widget with only one single dock widget, then we
 		// drop a top level widget that changes from floating to docked now
@@ -1802,7 +1818,7 @@ QList<CDockAreaWidget*> CDockContainerWidget::openedDockAreas() const
 	QList<CDockAreaWidget*> Result;
 	for (auto DockArea : d->DockAreas)
 	{
-		if (!DockArea->isHidden())
+		if (DockArea && !DockArea->isHidden())
 		{
 			Result.append(DockArea);
 		}
@@ -1818,7 +1834,7 @@ QList<CDockWidget*> CDockContainerWidget::openedDockWidgets() const
 	QList<CDockWidget*> DockWidgetList;
 	for (auto DockArea : d->DockAreas)
 	{
-		if (!DockArea->isHidden())
+		if (DockArea && !DockArea->isHidden())
 		{
 			DockWidgetList.append(DockArea->openedDockWidgets());
 		}
@@ -1833,7 +1849,7 @@ bool CDockContainerWidget::hasOpenDockAreas() const
 {
 	for (auto DockArea : d->DockAreas)
 	{
-		if (!DockArea->isHidden())
+		if (DockArea && !DockArea->isHidden())
 		{
 			return true;
 		}
@@ -2056,8 +2072,12 @@ CDockAreaWidget* CDockContainerWidget::topLevelDockArea() const
 QList<CDockWidget*> CDockContainerWidget::dockWidgets() const
 {
 	QList<CDockWidget*> Result;
-	for (const auto DockArea : d->DockAreas)
+    for (const auto& DockArea : d->DockAreas)
 	{
+		if (!DockArea)
+		{
+			continue;
+		}
 		Result.append(DockArea->dockWidgets());
 	}
 
@@ -2088,8 +2108,12 @@ void CDockContainerWidget::removeAutoHideWidget(CAutoHideDockContainer* Autohide
 CDockWidget::DockWidgetFeatures CDockContainerWidget::features() const
 {
 	CDockWidget::DockWidgetFeatures Features(CDockWidget::AllDockWidgetFeatures);
-	for (const auto DockArea : d->DockAreas)
+    for (const auto& DockArea : d->DockAreas)
 	{
+		if (!DockArea)
+		{
+			continue;
+		}
 		Features &= DockArea->features();
 	}
 
@@ -2107,9 +2131,9 @@ CFloatingDockContainer* CDockContainerWidget::floatingWidget() const
 //============================================================================
 void CDockContainerWidget::closeOtherAreas(CDockAreaWidget* KeepOpenArea)
 {
-	for (const auto DockArea : d->DockAreas)
+    for (const auto& DockArea : d->DockAreas)
 	{
-		if (DockArea == KeepOpenArea)
+		if (!DockArea || DockArea == KeepOpenArea)
 		{
 			continue;
 		}

src/DockContainerWidget.h

@@ -139,6 +139,11 @@ protected:
 	 */
 	void removeDockArea(CDockAreaWidget* area);
 
+	/**
+	 * Remove all dock areas and returns the list of removed dock areas
+	 */
+	QList<QPointer<CDockAreaWidget>> removeAllDockAreas();
+
 	/**
 	 * Saves the state into the given stream
 	 */

src/DockFocusController.cpp

@@ -115,6 +115,7 @@ DockFocusControllerPrivate::DockFocusControllerPrivate(
 //============================================================================
 void DockFocusControllerPrivate::updateDockWidgetFocus(CDockWidget* DockWidget)
 {
+	if (!DockWidget) return;
 	if (!DockWidget->features().testFlag(CDockWidget::DockWidgetFocusable))
 	{
 		return;

src/DockManager.cpp

@@ -103,8 +103,8 @@ static QString FloatingContainersTitle;
 struct DockManagerPrivate
 {
 	CDockManager* _this;
-	QList<CFloatingDockContainer*> FloatingWidgets;
-	QList<CFloatingDockContainer*> HiddenFloatingWidgets;
+	QList<QPointer<CFloatingDockContainer>> FloatingWidgets;
+	QList<QPointer<CFloatingDockContainer>> HiddenFloatingWidgets;
 	QList<CDockContainerWidget*> Containers;
 	CDockOverlay* ContainerOverlay;
 	CDockOverlay* DockAreaOverlay;
@@ -122,6 +122,7 @@ struct DockManagerPrivate
 	Qt::ToolButtonStyle ToolBarStyleFloating = Qt::ToolButtonTextUnderIcon;
 	QSize ToolBarIconSizeDocked = QSize(16, 16);
 	QSize ToolBarIconSizeFloating = QSize(24, 24);
+	CDockWidget::DockWidgetFeatures LockedDockWidgetFeatures;
 
 	/**
 	 * Private data constructor
@@ -153,7 +154,10 @@ struct DockManagerPrivate
 		// Hide updates of floating widgets from user
 		for (auto FloatingWidget : FloatingWidgets)
 		{
-			FloatingWidget->hide();
+			if (FloatingWidget)
+			{
+			  FloatingWidget->hide();
+			}
 		}
 	}
 
@@ -333,7 +337,8 @@ bool DockManagerPrivate::restoreStateFromXml(const QByteArray &state,  int versi
 		int FloatingWidgetIndex = DockContainerCount - 1;
 		for (int i = FloatingWidgetIndex; i < FloatingWidgets.count(); ++i)
 		{
-			auto* floatingWidget = FloatingWidgets[i];
+			CFloatingDockContainer* floatingWidget = FloatingWidgets[i];
+			if (!floatingWidget) continue;
 			_this->removeDockContainer(floatingWidget->dockContainer());
 			floatingWidget->deleteLater();
 		}
@@ -536,25 +541,41 @@ CDockManager::CDockManager(QWidget *parent) :
 CDockManager::~CDockManager()
 {
     // fix memory leaks, see https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/issues/307
-    std::vector<ads::CDockAreaWidget*> areas;
-    for ( int i = 0; i != dockAreaCount(); ++i )
-    {
-        areas.push_back( dockArea(i) );
-    }
-    for ( auto area : areas )
-    {
-        for ( auto widget : area->dockWidgets() )
-            delete widget;
+	std::vector<QPointer<ads::CDockAreaWidget>> areas;
+	for (int i = 0; i != dockAreaCount(); ++i)
+	{
+		areas.push_back( dockArea(i) );
+	}
+	for ( auto area : areas )
+	{
+		if (!area || area->dockManager() != this) continue;
 
-        delete area;
-    }
+		// QPointer delete safety - just in case some dock wigdet in destruction
+		// deletes another related/twin or child dock widget.
+		std::vector<QPointer<QWidget>> deleteWidgets;
+		for ( auto widget : area->dockWidgets() )
+		{
+			deleteWidgets.push_back(widget);
+		}
+		for ( auto ptrWdg : deleteWidgets)
+		{
+			delete ptrWdg;
+		}
+	}
 
 	auto FloatingWidgets = d->FloatingWidgets;
 	for (auto FloatingWidget : FloatingWidgets)
 	{
+		FloatingWidget->deleteContent();
 		delete FloatingWidget;
 	}
 
+	// Delete Dock Widgets before Areas so widgets can access them late (like dtor)
+	for ( auto area : areas )
+	{
+		delete area;
+	}
+
 	delete d;
 }
 
@@ -568,7 +589,7 @@ bool CDockManager::eventFilter(QObject *obj, QEvent *e)
 	// Window always on top of the MainWindow.
 	if (e->type() == QEvent::WindowActivate)
 	{
-		for (auto _window : floatingWidgets())
+        for (auto _window : d->FloatingWidgets)
 		{
 			if (!_window->isVisible() || window()->isMinimized())
 			{
@@ -590,7 +611,7 @@ bool CDockManager::eventFilter(QObject *obj, QEvent *e)
 	}
 	else if (e->type() == QEvent::WindowDeactivate)
 	{
-		for (auto _window : floatingWidgets())
+        for (auto _window : d->FloatingWidgets)
 		{
 			if (!_window->isVisible() || window()->isMinimized())
 			{
@@ -613,7 +634,7 @@ bool CDockManager::eventFilter(QObject *obj, QEvent *e)
 	// Sync minimize with MainWindow
 	if (e->type() == QEvent::WindowStateChange)
 	{
-		for (auto _window : floatingWidgets())
+        for (auto _window : d->FloatingWidgets)
 		{
 			if (! _window->isVisible())
 			{
@@ -725,7 +746,12 @@ const QList<CDockContainerWidget*> CDockManager::dockContainers() const
 //============================================================================
 const QList<CFloatingDockContainer*> CDockManager::floatingWidgets() const
 {
-	return d->FloatingWidgets;
+	QList<CFloatingDockContainer*> res;
+	for (auto &fl : d->FloatingWidgets)
+	{
+		if (fl) res.append(fl);
+	}
+	return res;
 }
 
 
@@ -1125,7 +1151,7 @@ QAction* CDockManager::addToggleViewActionToMenu(QAction* ToggleViewAction,
 	bool AlphabeticallySorted = (MenuAlphabeticallySorted == d->MenuInsertionOrder);
 	if (!Group.isEmpty())
 	{
-		QMenu* GroupMenu = d->ViewMenuGroups.value(Group, 0);
+		QMenu* GroupMenu = d->ViewMenuGroups.value(Group, nullptr);
 		if (!GroupMenu)
 		{
 			GroupMenu = new QMenu(Group, this);
@@ -1422,6 +1448,33 @@ QSize CDockManager::dockWidgetToolBarIconSize(CDockWidget::eState State) const
 }
 
 
+//===========================================================================
+void CDockManager::lockDockWidgetFeaturesGlobally(CDockWidget::DockWidgetFeatures Value)
+{
+	// Limit the features to CDockWidget::GloballyLockableFeatures
+	Value &= CDockWidget::GloballyLockableFeatures;
+	if (d->LockedDockWidgetFeatures == Value)
+	{
+		return;
+	}
+
+	d->LockedDockWidgetFeatures = Value;
+	// Call the notifyFeaturesChanged() function for all dock widgets to update
+	// the state of the close and detach buttons
+    for (auto DockWidget : d->DockWidgetsMap)
+    {
+    	DockWidget->notifyFeaturesChanged();
+    }
+}
+
+
+//===========================================================================
+CDockWidget::DockWidgetFeatures CDockManager::globallyLockedDockWidgetFeatures() const
+{
+	return d->LockedDockWidgetFeatures;
+}
+
+
 } // namespace ads
 
 //---------------------------------------------------------------------------

src/DockManager.h

@@ -660,6 +660,38 @@ public:
      */
     QSize dockWidgetToolBarIconSize(CDockWidget::eState State) const;
 
+    /**
+     * Returns all dock widget features that are globally locked by the dock
+     * manager.
+     * Globally locked features are removed from the features of all dock
+     * widgets.
+     */
+    CDockWidget::DockWidgetFeatures globallyLockedDockWidgetFeatures() const;
+
+    /**
+     * Globally Lock features of all dock widgets to "freeze" the current
+     * workspace layout.
+     * For example, it is now possible to lock the workspace to avoid
+     * accidentally dragging a docked view. Locking wasn’t possible before.
+     * So, users had to manually dock it back to the desired place after
+     * each accidental undock.
+     * You can use a combination of the following feature flags:
+     * - CDockWidget::DockWidgetClosable
+     * - CDockWidget::DockWidgetMovable
+     * - CDockWidget::DockWidgetFloatable
+     * - CDockWidget::DockWidgetPinable
+     *
+     * To clear the locked features, you can use CDockWidget::NoDockWidgetFeatures
+     * The following code shows how to lock and unlock dock widget features
+     * globally.
+     *
+     * \code
+     * DockManager->lockDockWidgetFeaturesGlobally();
+     * DockManager->lockDockWidgetFeaturesGlobally(CDockWidget::NoDockWidgetFeatures);
+     * \code
+     */
+    void lockDockWidgetFeaturesGlobally(CDockWidget::DockWidgetFeatures Features = CDockWidget::GloballyLockableFeatures);
+
 public Q_SLOTS:
 	/**
 	 * Opens the perspective with the given name.

src/DockWidget.cpp

@@ -80,8 +80,8 @@ struct DockWidgetPrivate
 	QWidget* Widget = nullptr;
 	CDockWidgetTab* TabWidget = nullptr;
 	CDockWidget::DockWidgetFeatures Features = CDockWidget::DefaultDockWidgetFeatures;
-	CDockManager* DockManager = nullptr;
-	CDockAreaWidget* DockArea = nullptr;
+	QPointer<CDockManager> DockManager;
+	QPointer<CDockAreaWidget> DockArea;
 	QAction* ToggleViewAction = nullptr;
 	bool Closed = false;
 	QScrollArea* ScrollArea = nullptr;
@@ -271,7 +271,10 @@ void DockWidgetPrivate::closeAutoHideDockWidgetsIfNeeded()
 		return;
 	}
 
-	if (!DockContainer->openedDockWidgets().isEmpty())
+	// If the dock container is the dock manager, or if it is not empty, then we
+	// don't need to do anything
+	if ((DockContainer == _this->dockManager())
+	 || !DockContainer->openedDockWidgets().isEmpty())
 	{
 		return;
 	}
@@ -382,7 +385,7 @@ CDockWidget::CDockWidget(const QString &title, QWidget *parent) :
 //============================================================================
 CDockWidget::~CDockWidget()
 {
-	ADS_PRINT("~CDockWidget()");
+    ADS_PRINT("~CDockWidget(): " << this->windowTitle());
 	delete d;
 }
 
@@ -511,10 +514,19 @@ void CDockWidget::setFeatures(DockWidgetFeatures features)
 		return;
 	}
 	d->Features = features;
+	notifyFeaturesChanged();
+}
+
+
+//============================================================================
+void CDockWidget::notifyFeaturesChanged()
+{
 	Q_EMIT featuresChanged(d->Features);
 	d->TabWidget->onDockWidgetFeaturesChanged();
 	if(CDockAreaWidget* DockArea = dockAreaWidget())
+	{
 		DockArea->onDockWidgetFeaturesChanged();
+	}
 }
 
 
@@ -530,7 +542,14 @@ void CDockWidget::setFeature(DockWidgetFeature flag, bool on)
 //============================================================================
 CDockWidget::DockWidgetFeatures CDockWidget::features() const
 {
-	return d->Features;
+	if (d->DockManager)
+	{
+		return d->Features &~ d->DockManager->globallyLockedDockWidgetFeatures();
+	}
+	else
+	{
+		return d->Features;
+	}
 }
 
 
@@ -566,7 +585,7 @@ CDockContainerWidget* CDockWidget::dockContainer() const
 	}
 	else
 	{
-		return 0;
+		return nullptr;
 	}
 }
 

src/DockWidget.h

@@ -165,6 +165,7 @@ public:
         DefaultDockWidgetFeatures = DockWidgetClosable | DockWidgetMovable | DockWidgetFloatable | DockWidgetFocusable | DockWidgetPinnable,
         AllDockWidgetFeatures = DefaultDockWidgetFeatures | DockWidgetDeleteOnClose | CustomCloseHandling,
         DockWidgetAlwaysCloseAndDelete = DockWidgetForceCloseWithArea | DockWidgetDeleteOnClose,
+        GloballyLockableFeatures = DockWidgetClosable | DockWidgetMovable | DockWidgetFloatable | DockWidgetPinnable,
         NoDockWidgetFeatures = 0x000
     };
     Q_DECLARE_FLAGS(DockWidgetFeatures, DockWidgetFeature)
@@ -256,7 +257,7 @@ public:
      * by calling setObjectName() after construction.
      * Use the layoutFlags to configure the layout of the dock widget.
      */
-    CDockWidget(const QString &title, QWidget* parent = 0);
+    CDockWidget(const QString &title, QWidget* parent = nullptr);
 
     /**
      * Virtual Destructor
@@ -336,6 +337,11 @@ public:
      */
     DockWidgetFeatures features() const;
 
+    /**
+     * Triggers notification of feature change signals and functions
+     */
+    void notifyFeaturesChanged();
+
     /**
      * Returns the dock manager that manages the dock widget or 0 if the widget
      * has not been assigned to any dock manager yet

src/DockWidgetTab.cpp

@@ -56,7 +56,6 @@
 
 namespace ads
 {
-static const char* const LocationProperty = "Location";
 using tTabLabel = CElidingLabel;
 
 /**
@@ -225,7 +224,7 @@ struct DockWidgetTabPrivate
 		QMenu* Menu)
 	{
 		auto Action = Menu->addAction(Title);
-		Action->setProperty("Location", Location);
+		Action->setProperty(internal::LocationProperty, Location);
 		QObject::connect(Action, &QAction::triggered, _this, &CDockWidgetTab::onAutoHideToActionClicked);
 		return Action;
 	}
@@ -764,7 +763,7 @@ void CDockWidgetTab::autoHideDockWidget()
 //===========================================================================
 void CDockWidgetTab::onAutoHideToActionClicked()
 {
-	int Location = sender()->property(LocationProperty).toInt();
+	int Location = sender()->property(internal::LocationProperty).toInt();
 	d->DockWidget->toggleAutoHide((SideBarLocation)Location);
 }
 

src/DockWidgetTab.h

@@ -84,7 +84,7 @@ public:
 	 * param[in] DockWidget The dock widget this title bar belongs to
 	 * param[in] parent The parent widget of this title bar
 	 */
-	CDockWidgetTab(CDockWidget* DockWidget, QWidget* parent = 0);
+	CDockWidgetTab(CDockWidget* DockWidget, QWidget* parent = nullptr);
 
 	/**
 	 * Virtual Destructor

src/ElidingLabel.h

@@ -58,8 +58,8 @@ protected:
 public:
     using Super = QLabel;
 
-    CElidingLabel(QWidget* parent = 0, Qt::WindowFlags f = Qt::WindowFlags ());
-    CElidingLabel(const QString& text, QWidget* parent = 0, Qt::WindowFlags f = Qt::WindowFlags ());
+    CElidingLabel(QWidget* parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags ());
+    CElidingLabel(const QString& text, QWidget* parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags ());
 	virtual ~CElidingLabel();
 
 	/**

src/FloatingDockContainer.cpp

@@ -357,7 +357,7 @@ static const char* windowsMessageString(int MessageId)
 #endif
 
 
-static unsigned int zOrderCounter = 0;
+static unsigned int zOrderCounterFloating = 0;
 /**
  * Private data class of CFloatingDockContainer class (pimpl)
  */
@@ -365,7 +365,7 @@ struct FloatingDockContainerPrivate
 {
 	CFloatingDockContainer *_this;
 	CDockContainerWidget *DockContainer;
-	unsigned int zOrderIndex = ++zOrderCounter;
+	unsigned int zOrderIndex = ++zOrderCounterFloating;
 	QPointer<CDockManager> DockManager;
 	eDragState DraggingState = DraggingInactive;
 	QPoint DragStartMousePosition;
@@ -760,6 +760,7 @@ CFloatingDockContainer::CFloatingDockContainer(CDockWidget *DockWidget) :
     d->DockManager->notifyWidgetOrAreaRelocation(DockWidget);
 }
 
+
 //============================================================================
 CFloatingDockContainer::~CFloatingDockContainer()
 {
@@ -771,6 +772,36 @@ CFloatingDockContainer::~CFloatingDockContainer()
 	delete d;
 }
 
+
+//============================================================================
+void CFloatingDockContainer::deleteContent()
+{
+	std::vector<QPointer<ads::CDockAreaWidget>> areas;
+	for (int i = 0; i != dockContainer()->dockAreaCount(); ++i)
+	{
+		areas.push_back( dockContainer()->dockArea(i) );
+	}
+	for (auto area : areas)
+	{
+		if (!area)
+		{
+			continue;
+		}
+
+		// QPointer delete safety - just in case some dock widget in destruction
+		// deletes another related/twin or child dock widget.
+		std::vector<QPointer<QWidget>> deleteWidgets;
+		for (auto widget : area->dockWidgets())
+		{
+			deleteWidgets.push_back(widget);
+		}
+		for (auto ptrWdg : deleteWidgets)
+		{
+			delete ptrWdg;
+		}
+	}
+}
+
 //============================================================================
 CDockContainerWidget* CFloatingDockContainer::dockContainer() const
 {
@@ -787,7 +818,7 @@ void CFloatingDockContainer::changeEvent(QEvent *event)
 		if (isActiveWindow())
 		{
 			ADS_PRINT("FloatingWidget::changeEvent QEvent::ActivationChange ");
-			d->zOrderIndex = ++zOrderCounter;
+			d->zOrderIndex = ++zOrderCounterFloating;
 
 #if defined(Q_OS_UNIX) && !defined(Q_OS_MACOS)
 			if (d->DraggingState == DraggingFloatingWidget)
@@ -1142,7 +1173,7 @@ QList<CDockWidget*> CFloatingDockContainer::dockWidgets() const
 }
 
 //============================================================================
-void CFloatingDockContainer::hideAndDeleteLater()
+void CFloatingDockContainer::finishDropOperation()
 {
 	// Widget has been redocked, so it must be hidden right way (see 
 	// https://github.com/githubuser0xFFFF/Qt-Advanced-Docking-System/issues/351)
@@ -1150,6 +1181,11 @@ void CFloatingDockContainer::hideAndDeleteLater()
 	// dock widgets that shall not be toggled hidden.
 	d->AutoHideChildren = false;
 	hide();
+	// The floating widget will be deleted now. Ensure, that the destructor
+	// of the floating widget does not delete any dock areas that have been
+	// moved to a new container - simply remove all dock areas before deleting
+	// the floating widget
+	d->DockContainer->removeAllDockAreas();
 	deleteLater();
 	if (d->DockManager)
 	{
@@ -1295,7 +1331,8 @@ void CFloatingDockContainer::onMaximizeRequest()
 //============================================================================
 void CFloatingDockContainer::showNormal(bool fixGeometry)
 {
-	if (windowState() == Qt::WindowMaximized)
+    if ( (windowState() & Qt::WindowMaximized) != 0 ||
+         (windowState() & Qt::WindowFullScreen) != 0)
 	{
 		QRect oldNormal = normalGeometry();
 		Super::showNormal();

src/FloatingDockContainer.h

@@ -146,6 +146,13 @@ protected:
 	 */
 	virtual void finishDragging() override;
 
+	/**
+	 * This function deletes all dock widgets in it.
+	 * This functions should be called only from dock manager in its
+	 * destructor before deleting the floating widget
+     */
+	void deleteContent();
+
 	/**
 	 * Call this function if you just want to initialize the position
 	 * and size of the floating widget
@@ -258,9 +265,9 @@ public:
     QList<CDockWidget*> dockWidgets() const;
 
 	/**
-	 * This function hides the floating bar instantely and delete it later.
+	 * This function hides the floating widget instantly and delete it later.
 	 */
-	void hideAndDeleteLater();
+	void finishDropOperation();
 
 #if defined(Q_OS_UNIX) && !defined(Q_OS_MACOS)
     /**

src/ads_globals.cpp

@@ -92,7 +92,7 @@ xcb_atom_t xcb_get_atom(const char *name)
 	}
 	xcb_connection_t *connection = x11_connection();
 	xcb_intern_atom_cookie_t request = xcb_intern_atom(connection, 1, strlen(name), name);
-	xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(connection, request, NULL);
+	xcb_intern_atom_reply_t *reply = xcb_intern_atom_reply(connection, request, nullptr);
 	if (!reply)
 	{
 		return XCB_ATOM_NONE;

src/ads_globals.h

@@ -158,7 +158,7 @@ enum SideBarLocation
 	SideBarBottom,
 	SideBarNone
 };
-Q_ENUMS(SideBarLocation);
+Q_ENUMS(SideBarLocation)
 
 
 namespace internal
@@ -167,6 +167,7 @@ static const bool RestoreTesting = true;
 static const bool Restore = false;
 static const char* const ClosedProperty = "close";
 static const char* const DirtyProperty = "dirty";
+static const char* const LocationProperty = "Location";
 extern const int FloatingWidgetDragStartEvent;
 extern const int DockedWidgetDragStartEvent;
 

src/linux/FloatingWidgetTitleBar.cpp

@@ -137,11 +137,11 @@ CFloatingWidgetTitleBar::CFloatingWidgetTitleBar(CFloatingDockContainer *parent)
 	d->FloatingWidget = parent;
 	d->createLayout();
 
-    auto normalPixmap = this->style()->standardPixmap(QStyle::SP_TitleBarNormalButton, 0, d->MaximizeButton);
+    auto normalPixmap = this->style()->standardPixmap(QStyle::SP_TitleBarNormalButton, nullptr, d->MaximizeButton);
     d->NormalIcon.addPixmap(normalPixmap, QIcon::Normal);
     d->NormalIcon.addPixmap(internal::createTransparentPixmap(normalPixmap, 0.25), QIcon::Disabled);
 
-    auto maxPixmap = this->style()->standardPixmap(QStyle::SP_TitleBarMaxButton, 0, d->MaximizeButton);
+    auto maxPixmap = this->style()->standardPixmap(QStyle::SP_TitleBarMaxButton, nullptr, d->MaximizeButton);
     d->MaximizeIcon.addPixmap(maxPixmap, QIcon::Normal);
     d->MaximizeIcon.addPixmap(internal::createTransparentPixmap(maxPixmap, 0.25), QIcon::Disabled);
     setMaximizedIcon(d->Maximized);